Improvement in chimney-cowls



G. O. 'G. KENNEL.

Chimney-Cowl.

No. 211,333. Patented Jan. 14, 1879.

WITNESSES: INVBNTOR: flaw firuQoz, (7. /W W BY ATTORNEYS.

N-PEFER5, PHOTOLITHOGRAPHER, WASHINGTON, 11.0.

UNITED STATES PATENT OFFICE.

eHAELEs 0. e. KENNEL, OF NEW YORK, N. Y., ASSIGNOR TO HIMsELE,

THOMAS e. HOLLAND, AND RALPH IRVIN, OF sAME PLACE.

IMPROVEMENT IN CHI MNEY-COWLS.

Specification forming part of Letters Patent No. 211,333, dated January14, 1879; application filed July 5, 1878.

To all whom it may concern:

Be it known that I, CHARLES O. G. KEN- NEL, of the city, county, andState of New York, have invented a new and Improved Chimney-Cowl, ofwhich the following is a specification Figure 1 is a side elevation ofmy improved cowl. Fig. 2 is a vertical section.

Similar letters of reference indicate corresponding parts.

. and having spaces between the successive convolutions of the spiral.The spirals overlap each other and increase in diameter toward the top.w

The coils are connected, at intervals, by stays a, and the end of theupper and outer coil is lapped onto the one that precedes it, and istrimmed ofl' horizontally, and upon it a flange, b, is formed, which isnotched or serrated. The pipe of which the chimney-top is formed extendsnearly to the top of the spiral.

The top of the cowl consists of an inner cone, 0, and an outer cone, 1),which are secured together by attachment to arms 0, which radiate fromthe base of the inner cone and arefastened to the base of the outercone.

The inner cone, (3, is of larger diameter than the chimney-top, and issupported a small distance from it. The outer cone is larger at its basethan the top of the spiral attached to the chimney-top, and it isprovided with a narrow downwardly-projecting rim, e,which surrounds theserrated flange b and keeps the cones in place.

The cone D is made from a strip of sheet metal, which is coiledspirally, the upper coils overlapping the lower ones and diminishing indiameter toward the top, where it terminates in a point. There is asmall space between the successive convolutions for the escape of smoke.The several convolutions of the spiral of which the cone is formed arestayed by strips f, which are either soldered or riveted to the coils.

It will be seen that this construction renders it impossible for thewind to blow down the chimney, and also prevents the entrance of snow orrain, while it permit-s of the free exit of heat and smoke.

A side current of air from any direction promotes the draft, and theeffectiveness of the device is increased by the extension of thechimneytop through the spiral.

1 am aware that a chimney cap or pot has been proposed in England whichis constructed of a lower metallic cylinder, to which is attached aplate which is curved or convoluted in the manner of a helix around anassumed vertical axial line, the convolutions gradually increasingupward in diameter, and a sufficient space being left between eachconvolution to allowa free current of air to pass through the Theconvoluted plate is surmounted by a cylinder, which forms the top of thechimney-pot, said top being perforated or slotted for the passage ofair.

Having thus described my invention, I claim as new and desire to secureby Letters Pat ent- 1. The combination of the spirally-bent strip B withthe chimney-top A, when the latter extends nearly, or quite, through thespiral formed of the said strip B, substantially as shown and described.

2. A cowl for chimney-top consisting of a conical spiral formed of sheetmetal, in which the upper convolutions overlap the lower convolutions,substantially as herein shown and described.

3. A chimney-cap consisting of the outer cone, D, formed of aspirally-bent strip of metal, and the inner hollow sheet-metal cone, 0,substantially as herein shown and described.

CHARLES O. G. KENNEL.

Witnesses GHAs. SEDGWICK, ALEX. F. RoBEE'rs.

